EP3490185B1 - Techniques of efficient dmrs and data transmission and reception in wireless communication systems - Google Patents

Techniques of efficient dmrs and data transmission and reception in wireless communication systems Download PDF

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Publication number
EP3490185B1
EP3490185B1 EP17837232.2A EP17837232A EP3490185B1 EP 3490185 B1 EP3490185 B1 EP 3490185B1 EP 17837232 A EP17837232 A EP 17837232A EP 3490185 B1 EP3490185 B1 EP 3490185B1
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Prior art keywords
transmission
dmrs
information
pusch
signal
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German (de)
English (en)
French (fr)
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EP3490185A1 (en
EP3490185A4 (en
Inventor
Seonwook Kim
Suckchel Yang
Kijun Kim
Joonkui Ahn
Hyukjin Chae
Youngtae Kim
Seunggye Hwang
Seungmin Lee
Daesung HWANG
Kyuhwan KWAK
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0628—Diversity capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/0012—Hopping in multicarrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the following description relates to a wireless communication system, and more particularly, to a method of transmitting and receiving a signal between a user equipment (UE) and a base station (BS) in a wireless communication system, and an apparatus supporting the same.
  • UE user equipment
  • BS base station
  • the following description includes a description of a method of transmitting and receiving a signal by applying a different beamforming scheme to each predetermined resource area, performed by a BS or a UE, and an apparatus supporting the same.
  • the following description includes a description of a method of transmitting an uplink control channel or an uplink shared channel by applying a different beamforming scheme to each time/frequency resource area according to a predetermined rule, performed by a UE, and an apparatus supporting the same according to the present invention.
  • a wireless access system is a multiple access system that supports communication of multiple users by sharing available system resources (a bandwidth, transmission power, etc.) among them.
  • multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a Single Carrier Frequency Division Multiple Access (SC-FDMA) system.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • MTC massive machine type communications
  • US2014/0286255A1 and US2014/0293881A1 relate to uplink demodulation reference signals in advanced wireless communication systems.
  • mapping pattern of PUSCH and DMRS are disclosed and discussed.
  • An aspect of the present invention is to provide a method of transmitting and receiving a signal between a user equipment (UE) and a base station (BS) in a new proposed communication system, and an apparatus supporting the same.
  • UE user equipment
  • BS base station
  • an aspect of the present invention is to provide a method of transmitting an uplink signal in a precoder cycling scheme which applies a different beamforming scheme to each predetermined resource area by a UE, for efficient transmission of the uplink signal (e.g., control information, data information, etc.) to a BS, and an apparatus supporting the same.
  • a precoder cycling scheme which applies a different beamforming scheme to each predetermined resource area by a UE, for efficient transmission of the uplink signal (e.g., control information, data information, etc.) to a BS, and an apparatus supporting the same.
  • a UE can efficiently transmit an uplink signal to a BS in a new proposed wireless communication system.
  • a UE can efficiently transmit a physical uplink control channel (PUCCH) including a predetermined number of symbols to a BS.
  • PUCCH physical uplink control channel
  • a BS refers to a terminal node of a network, which directly communicates with a UE.
  • a specific operation described as being performed by the BS may be performed by an upper node of the BS.
  • a network comprised of a plurality of network nodes including a BS
  • various operations performed for communication with a UE may be performed by the BS, or network nodes other than the BS.
  • the term 'BS' may be replaced with a fixed station, a Node B, an evolved Node B (eNode B or eNB), an Advanced Base Station (ABS), an access point, etc.
  • the term terminal may be replaced with a UE, a Mobile Station (MS), a Subscriber Station (SS), a Mobile Subscriber Station (MSS), a mobile terminal, an Advanced Mobile Station (AMS), etc.
  • MS Mobile Station
  • SS Subscriber Station
  • MSS Mobile Subscriber Station
  • AMS Advanced Mobile Station
  • a transmission end is a fixed and/or mobile node that provides a data service or a voice service and a reception end is a fixed and/or mobile node that receives a data service or a voice service. Therefore, a UE may serve as a transmission end and a BS may serve as a reception end, on an UpLink (UL). Likewise, the UE may serve as a reception end and the BS may serve as a transmission end, on a DownLink (DL).
  • UL UpLink
  • DL DownLink
  • the embodiments of the present disclosure may be supported by standard specifications disclosed for at least one of wireless access systems including an Institute of Electrical and Electronics Engineers (IEEE) 802.xx system, a 3rd Generation Partnership Project (3GPP) system, a 3GPP Long Term Evolution (LTE) system, and a 3GPP2 system.
  • the embodiments of the present disclosure may be supported by the standard specifications, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 36.331. That is, the steps or parts, which are not described to clearly reveal the technical idea of the present disclosure, in the embodiments of the present disclosure may be explained by the above standard specifications. All terms used in the embodiments of the present disclosure may be explained by the standard specifications.
  • TxOP may be used interchangeably with transmission period or Reserved Resource Period (RRP) in the same sense.
  • RRP Reserved Resource Period
  • a Listen-Before-Talk (LBT) procedure may be performed for the same purpose as a carrier sensing procedure for determining whether a channel state is idle or busy, CCA (Clear Channel Assessment), CAP (Channel Access Procedure).
  • 3GPP LTE/LTE-A systems are explained, which are examples of wireless access systems.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented as a radio technology such as Global System for Mobile communications (GSM)/General packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • OFDMA may be implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc.
  • UTRA is a part of Universal Mobile Telecommunications System (UMTS).
  • 3GPP LTE is a part of Evolved UMTS (E-UMTS) using E-UTRA, adopting OFDMA for DL and SC-FDMA for UL.
  • LTE-Advanced (LTE-A) is an evolution of 3GPP LTE. While the embodiments of the present disclosure are described in the context of a 3GPP LTE/LTE-A system in order to clarify the technical features of the present disclosure, the present disclosure is also applicable to an IEEE 802.16e/m system, etc.
  • a UE receives information from an eNB on a DL and transmits information to the eNB on a UL.
  • the information transmitted and received between the UE and the eNB includes general data information and various types of control information.
  • FIG. 1 illustrates physical channels and a general signal transmission method using the physical channels, which may be used in embodiments of the present disclosure.
  • the UE When a UE is powered on or enters a new cell, the UE performs initial cell search (S11).
  • the initial cell search involves acquisition of synchronization to an eNB. Specifically, the UE synchronizes its timing to the eNB and acquires information such as a cell Identifier (ID) by receiving a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the eNB.
  • ID cell Identifier
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the UE may acquire information broadcast in the cell by receiving a Physical Broadcast Channel (PBCH) from the eNB.
  • PBCH Physical Broadcast Channel
  • the UE may monitor a DL channel state by receiving a Downlink Reference Signal (DL RS).
  • DL RS Downlink Reference Signal
  • the UE may acquire more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and receiving a Physical Downlink Shared Channel (PDSCH) based on information of the PDCCH (S12).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the UE may perform a random access procedure with the eNB (S13 to S16).
  • the UE may transmit a preamble on a Physical Random Access Channel (PRACH) (S13) and may receive a PDCCH and a PDSCH associated with the PDCCH (S14).
  • PRACH Physical Random Access Channel
  • the UE may additionally perform a contention resolution procedure including transmission of an additional PRACH (S15) and reception of a PDCCH signal and a PDSCH signal corresponding to the PDCCH signal (S16).
  • the UE may receive a PDCCH and/or a PDSCH from the eNB (S17) and transmit a Physical Uplink Shared Channel (PUSCH) and/or a Physical Uplink Control Channel (PUCCH) to the eNB (S18), in a general UL/DL signal transmission procedure.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the UCI includes a Hybrid Automatic Repeat and reQuest Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK), a Scheduling Request (SR), a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc.
  • HARQ-ACK/NACK Hybrid Automatic Repeat and reQuest Acknowledgement/Negative Acknowledgement
  • SR Scheduling Request
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Index
  • RI Rank Indicator
  • UCI is generally transmitted on a PUCCH periodically. However, if control information and traffic data should be transmitted simultaneously, the control information and traffic data may be transmitted on a PUSCH. In addition, the UCI may be transmitted aperiodically on the PUSCH, upon receipt of a request/command from a network.
  • FIG. 2 illustrates exemplary radio frame structures used in embodiments of the present disclosure.
  • FIG. 2(a) illustrates frame structure type 1.
  • Frame structure type 1 is applicable to both a full Frequency Division Duplex (FDD) system and a half FDD system.
  • FDD Frequency Division Duplex
  • One subframe includes two successive slots.
  • An ith subframe includes 2ith and (2i+1)th slots. That is, a radio frame includes 10 subframes.
  • a time required for transmitting one subframe is defined as a Transmission Time Interval (TTI).
  • One slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols or SC-FDMA symbols in the time domain by a plurality of Resource Blocks (RBs) in the frequency domain.
  • OFDM Orthogonal Frequency Division Multiplexing
  • RBs Resource Blocks
  • a slot includes a plurality of OFDM symbols in the time domain. Since OFDMA is adopted for DL in the 3GPP LTE system, one OFDM symbol represents one symbol period. An OFDM symbol may be called an SC-FDMA symbol or symbol period. An RB is a resource allocation unit including a plurality of contiguous subcarriers in one slot.
  • each of 10 subframes may be used simultaneously for DL transmission and UL transmission during a 10-ms duration.
  • the DL transmission and the UL transmission are distinguished by frequency.
  • a UE cannot perform transmission and reception simultaneously in a half FDD system.
  • the above radio frame structure is purely exemplary.
  • the number of subframes in a radio frame, the number of slots in a subframe, and the number of OFDM symbols in a slot may be changed.
  • FIG. 2(b) illustrates frame structure type 2.
  • Frame structure type 2 is applied to a Time Division Duplex (TDD) system.
  • TDD Time Division Duplex
  • a type-2 frame includes a special subframe having three fields, Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS).
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Period
  • UpPTS Uplink Pilot Time Slot
  • the DwPTS is used for initial cell search, synchronization, or channel estimation at a UE
  • the UpPTS is used for channel estimation and UL transmission synchronization with a UE at an eNB.
  • the GP is used to cancel UL interference between a UL and a DL, caused by the multi-path delay of a DL signal.
  • FIG. 3 illustrates an exemplary structure of a DL resource grid for the duration of one DL slot, which may be used in embodiments of the present disclosure.
  • a DL slot includes a plurality of OFDM symbols in the time domain.
  • One DL slot includes 7 OFDM symbols in the time domain and an RB includes 12 subcarriers in the frequency domain, to which the present disclosure is not limited.
  • Each element of the resource grid is referred to as a Resource Element (RE).
  • An RB includes 12x7 REs.
  • the number of RBs in a DL slot, NDL depends on a DL transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 4 illustrates a structure of a UL subframe which may be used in embodiments of the present disclosure.
  • a UL subframe may be divided into a control region and a data region in the frequency domain.
  • a PUCCH carrying UCI is allocated to the control region and a PUSCH carrying user data is allocated to the data region.
  • a UE does not transmit a PUCCH and a PUSCH simultaneously.
  • a pair of RBs in a subframe are allocated to a PUCCH for a UE.
  • the RBs of the RB pair occupy different subcarriers in two slots. Thus it is said that the RB pair frequency-hops over a slot boundary.
  • FIG. 5 illustrates a structure of a DL subframe that may be used in embodiments of the present disclosure.
  • DL control channels defined for the 3GPP LTE system include a Physical Control Format Indicator Channel (PCFICH), a PDCCH, and a Physical Hybrid ARQ Indicator Channel (PHICH).
  • PCFICH Physical Control Format Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the PCFICH is transmitted in the first OFDM symbol of a subframe, carrying information about the number of OFDM symbols used for transmission of control channels (i.e. the size of the control region) in the subframe.
  • the PHICH is a response channel to a UL transmission, delivering an HARQ ACK/NACK signal.
  • Control information carried on the PDCCH is called Downlink Control Information (DCI).
  • the DCI transports UL resource assignment information, DL resource assignment information, or UL Transmission (Tx) power control commands for a UE group.
  • MTC massive Machine-Type Communications
  • New Radio New Radio
  • FIG. 6 is a diagram illustrating a self-contained subframe structure applicable to the present invention.
  • a self-contained subframe structure as shown in FIG. 6 is proposed in order to minimize data transmission latency in the TDD system.
  • DL transmission and UL transmission may be sequentially performed in one subframe.
  • DL data may be transmitted and received in one subframe and UL ACK/NACK therefor may be transmitted and received in the same subframe.
  • this structure may reduce time taken to retransmit data when a data transmission error occurs, thereby minimizing the latency of final data transmission.
  • a time gap having a certain time length is required in order for the base station and the UE to switch from the transmission mode to the reception mode or from the reception mode to the transmission mode.
  • some OFDM symbols at the time of switching from DL to UL in the self-contained subframe structure may be set as a guard period (GP).
  • the control regions may be selectively included in the self-contained subframe structure.
  • the self-contained subframe structure according to the present invention may include not only the case of including both the DL control region and the UL control region but also the case of including either the DL control region or the UL control region alone as shown in FIG. 6 .
  • the frame structure configured as above is referred to as a subframe, but this configuration can also be referred to as a frame or a slot.
  • a subframe or a frame may be replaced with the slot described above.
  • the NR system uses the OFDM transmission scheme or a similar transmission scheme.
  • the NR system may typically have the OFDM numerology as shown in Table 2.
  • Table 2 Parameter Value Subcarrier-spacing ( ⁇ f ) 75 kHz OFDM symbol length 13.33 ⁇ s Cyclic Prefix(CP) length 1.04us/0.94 ⁇ s System BW 100 MHz No. of available subcarriers 1200 Subframe length 0.2 ms Number of OFDM symbol per Subframe 14 symbols
  • the NR system may use the OFDM transmission scheme or a similar transmission scheme, and may use an OFDM numerology selected from among multiple OFDM numerologies as shown in Table 3. Specifically, as disclosed in Table 3, the NR system may take the 15 kHz subcarrier-spacing used in the LTE system as a base, and use an OFDM numerology having subcarrier-spacing of 30, 60, and 120 kHz, which are multiples of the 15 kHz subcarrier-spacing.
  • the cyclic prefix, the system bandwidth (BW) and the number of available subcarriers disclosed in Table 3 are merely an example that is applicable to the NR system according to the present invention, and the values thereof may vary depending on the implementation method.
  • the system bandwidth may be set to 100 MHz.
  • the number of available subcarriers may be greater than 1500 and less than 1666.
  • the subframe length and the number of OFDM symbols per subframe disclosed in Table 3 are merely an example that is applicable to the NR system according to the present invention, and the values thereof may vary depending on the implementation method.
  • a millimeter wave (mmW) system since a wavelength is short, a plurality of antenna elements can be installed in the same area. That is, considering that the wavelength at 30 GHz band is 1 cm, a total of 100 antenna elements can be installed in a 5 ⁇ 5 cm panel at intervals of 0.5 lambda (wavelength) in the case of a 2-dimensional array. Therefore, in the mmW system, it is possible to improve the coverage or throughput by increasing the beamforming (BF) gain using multiple antenna elements.
  • BF beamforming
  • each antenna element can include a transceiver unit (TXRU) to enable adjustment of transmit power and phase per antenna element.
  • TXRU transceiver unit
  • hybrid BF with B TXRUs that are fewer than Q antenna elements can be considered.
  • the number of beam directions that can be transmitted at the same time is limited to B or less, which depends on how B TXRUs and Q antenna elements are connected.
  • FIGS. 7 and 8 are diagrams illustrating representative methods for connecting TXRUs to antenna elements.
  • the TXRU virtualization model represents the relationship between TXRU output signals and antenna element output signals.
  • FIG. 7 shows a method for connecting TXRUs to sub-arrays.
  • one antenna element is connected to one TXRU.
  • FIG. 8 shows a method for connecting all TXRUs to all antenna elements.
  • all antenna element are connected to all TXRUs.
  • separate addition units are required to connect all antenna elements to all TXRUs as shown in FIG. 8 .
  • W indicates a phase vector weighted by an analog phase shifter. That is, W is a major parameter determining the direction of the analog beamforming.
  • the mapping relationship between CSI-RS antenna ports and TXRUs may be 1:1 or 1-to-many.
  • the configuration shown in FIG. 7 has a disadvantage in that it is difficult to achieve beamforming focusing but has an advantage in that all antennas can be configured at low cost.
  • the configuration shown in FIG. 8 is advantageous in that beamforming focusing can be easily achieved.
  • all antenna elements are connected to the TXRU, it has a disadvantage of high cost.
  • FIG. 9 is a simplified diagram illustrating a frame structure carrying UL data in a new RAT (NR) system to which the present invention is applicable.
  • a transmission time interval (TTI) may be defined as a minimum time interval during which the medium access control (MAC) layer transmits MAC protocol data units (PDUs) to the physical (PHY) layer. While it is assumed that one TTI includes 14 symbols in FIG. 9 , the TTI may be configured to have a longer or shorter time length.
  • a NewRAT physical downlink control channel refers to a DL control channel carrying DL/UL scheduling information
  • a NewRAT physical uplink shared channel refers to a UL channel carrying UL data
  • a NewRAT physical uplink control channel refers to a UL control channel carrying information such as hybrid automatic repeat request-acknowledgement (HARQ-ACK/channel state information (CSI).
  • CSI hybrid automatic repeat request-acknowledgement
  • DM-RS demodulation reference signal refers to a signal used for channel estimation performed to demodulate the NR-PUSCH.
  • each signal/channel may be transmitted in a specific symbol(s), and on a different subcarrier per antenna port (AP).
  • each signal/channel may be transmitted through up to 4 APs.
  • a phase noise compensation reference signal (PCRS)/phase tracking reference signal (PTRS) (hereinafter, referred to collectively as a PTRS) refers to a signal transmitted in addition to the DM-RS in order to help with channel estimation in consideration of high mobility or the phase noise of an oscillator.
  • the PTRS may be configured to be transmitted on a specific subcarrier(s), and in a different symbol/on a different subcarrier per AP. While configurations applicable to the present invention are proposed on the basis of the basic frame structure illustrated in FIG. 9 for the convenience of description, those skilled in the art will clearly understand that the configurations are also applicable to frame structures which differ from the frame structure of FIG. 9 in terms of the transmission resource areas and positions of an NR-PDCCH, a guard period, an NR-PUSCH, an NR-PUCCH, a PTRS, and a DM-RS.
  • the legacy LTE(-A) system supports both of a TxD-based method and a spatial multiplexing (SM)-based method.
  • SM spatial multiplexing
  • the legacy LTE(-A) system supports only an SM-based method for UL transmission.
  • the NR system may also support a TxD transmission method for UL transmission.
  • TxD indicating method and the TxD transmission method are also applicable in the same manner to other channels.
  • TxD for the NR-PDSCH/NR-PUSCH may be indicated by a DL grant in methods proposed in section 3.1.1 below.
  • the TxD transmission method is also applicable in the same manner to the NR-PDCCH/NR-PDSCH/NR-PUCCH.
  • it may be indicated dynamically whether to transmit UL data in a TxD transmission method or an SM transmission method according to the channel state of a UE or the service type of the UL data.
  • information indicating TxD may be jointly encoded with scheduling information indicating a precoding matrix used for SM.
  • a new generation Node B may indicate TxD by some state of a field in DCI indicating a precoding matrix (or a codebook index) and the number of layers. Additionally, the gNB may indicate how many APs/layers or which APs are used for TxD by an additional field or another state of the above-described field.
  • a BS operating in the NR system according to the present invention is referred to as a gNB, distinguishably from an eNB which is an exemplary LTE BS.
  • eNB which is an exemplary LTE BS.
  • the term gNB may be replaced with eNB depending on an implementation example.
  • the gNB may differentiate DCI formats for TxD transmission and SM transmission, and accordingly indicate TxD or SM to a UE by a DCI format indicator.
  • the gNB may semi-statically indicate TxD or SM by RRC signaling.
  • the legacy LTE system adopts SFBC as a TxD transmission method for DL transmission.
  • This method is designed so as to achieve an optimum diversity gain for 2Tx1Rx (i.e., 2 Txs and 1 Rx).
  • 2Tx1Rx i.e., 2 Txs and 1 Rx.
  • the present invention proposes a TxD transmission method to increase the diversity gain of UL transmission.
  • the basic idea of the present invention is to achieve a spatial-domain multiplexing gain by multiplying a signal by a (quasi-)orthogonal sequence per AP, prior to transmission.
  • An orthogonal sequence of length k (k is the number of transmission APs) is multiplied across (non-)contiguous k resources along the frequency axis (or the time axis), and the same modulated symbol is repeatedly transmitted in the k resources.
  • FIG. 10 is a simplified diagram illustrating a TxD transmission method according to an example of the present invention.
  • a TxD method with 4 APs may be used as a UL signal transmission method. Since a UL signal is transmitted through the 4 APs, the same modulated symbol (e.g., "a" in FIG. 10 ) is repeatedly mapped to 4 subcarriers, and a length-4 orthogonal sequence (e.g., Hadamard sequence) is multiplied by the symbols on the subcarriers, for each AP (or layer).
  • SC-FDM single carrier-frequency division multiplexing
  • this process needs to be performed before discrete Fourier transform (DFT). If OFDM is adopted for UL transmission, the process may be performed before or after inverse fast Fourier transform (IFFT).
  • DFT discrete Fourier transform
  • IFFT inverse fast Fourier transform
  • subcarriers may be grouped into groups each including 4 subcarriers, and an operation of the present invention may be performed in units of 4 subcarriers.
  • 4 subcarriers may form one transmission group. If a PTRS is transmitted on a specific subcarrier(s), it may be difficult to group subcarriers by fours.
  • a symbol may be transmitted repeatedly on the N subcarriers in the same manner as N APs transmit signals in TxD, and a length-N orthogonal sequence may be multiplied by the symbols. For example, if the PTRS is transmitted in the manner illustrated in FIG. 9 , subcarriers #0, #1, #2 and #3, and subcarriers #8, #9, #10 and #11 are grouped respectively, with subcarriers #5 and #6 paired. Then, a signal may be transmitted on subcarriers #5 and #6 in TxD only through two APs, AP#1 and AP #2.
  • a length-k orthogonal sequence (k is the number of transmission APs) is multiplied across (non-contiguous k resources on the frequency axis (or the time axis)
  • the same modulated symbol may be repeatedly transmitted in the k resources, or k or fewer modulated symbols may be transmitted in the k resources.
  • a modulated symbol "a” may be repeatedly transmitted in layers #1 and #2
  • a modulation symbol "b" may be repeatedly transmitted in layers #3 and #4.
  • k when a length-k orthogonal sequence is multiplied across (non-)contiguous k resources on the frequency axis (or the time axis), k may be larger than the number of transmission APs.
  • the same modulated symbol may be repeatedly transmitted or different modulated symbols may be transmitted in code division multiplexing (CDM), in a specific layer.
  • CDM code division multiplexing
  • the afore-proposed various TxD methods and TxD methods proposed in section 3.1.3 below may be configured differently according to modulation orders, modulation and coding schemes (MCSs), use cases/services, or the like.
  • MCSs modulation and coding schemes
  • PAPR peak-to-average power ratio
  • a TxD method simply using a codebook of an identity matrix may be applied for an MCS equal to or larger than a predetermined value.
  • a TxD method with a smaller repetition number may be applied in this section.
  • a TxD method for DL transmission is implemented in SFBC.
  • SFBC-based Tx transmission methods are defined for 2 APs/layers, and 4 APs/layers in the LTE system.
  • FIG. 11 is a simplified diagram illustrating a TxD method in the case of 2 APs/layers for DL transmission in the legacy LTE system
  • FIG. 12 is a simplified diagram illustrating a TxD method in the case of 4 APs/layers for DL transmission in the legacy LTE system.
  • the PAPR performance of layer 1 may be same in consideration of SC-FDM. However, for layer 2, the single carrier property is not maintained, thereby degrading PAPR performance. In this section, a method of overcoming the problem is proposed.
  • FIGS. 13 and 14 are simplified diagrams illustrating SFBC-based TxD transmission methods according to an example of the present invention.
  • FIG. 13 illustrates an SFBC scheme applied to the above first example.
  • the pair is mapped with one of the symbols "conjugated" in one of the layers, while the two symbols are swapped in position, with the other symbol "conjugated” in the other layer.
  • SFBC is applied as illustrated in FIG. 13 in the SFBC-based TxD transmission method according to the first example of the present invention.
  • SFBC may be applied on a pair basis.
  • M may be set by physical-layer signaling or higher-layer signaling. The above method is also applicable in the same manner to a case of more than 2 APs/layers.
  • mapping relationship between a coded bit stream and APs/layers is fixed for DL, so it is not to be changed on the time/frequency axis in the legacy LTE system.
  • This configuration may advantageously increase a diversity gain by permuting the mapping relationship on the time/frequency axis.
  • FIG. 15 is a simplified diagram illustrating an SFBC-based TxD transmission method according to another example of the present invention.
  • SFBC may be applied to a ⁇ C1, C2 ⁇ pair through APs #1 and #2, while SFBC may be applied to a ⁇ C3, C4 ⁇ pair through APs #3 and #4.
  • both of the SFBC method illustrated in FIG. 15 and the SFBC method illustrated in FIG. 12 may be applied in the present invention.
  • Each of the SFBC methods may be performed in a predetermined rule or a rule indicated by physical-layer signaling or higher-layer signaling.
  • the SFBC method illustrated in FIG. 15 may be applied to even-numbered symbols, while the SFBC method illustrated in FIG. 12 may be applied to odd-numbered symbols.
  • the SFBC method illustrated in FIG. 15 and the SFBC method illustrated in FIG. 12 may be applied alternately every four subcarriers in an allocated frequency resource area within the same symbol. Additionally, aside from the afore-described two SFBC methods, various combinations of mapping methods are available for mapping the ⁇ C1, C2 ⁇ pair and the ⁇ C3, C4 ⁇ pair to APs.
  • TxD transmission methods have been described in section 3.1.3.1. and section 3.1.3.2. with the appreciation that SFBC is applied only on the frequency axis.
  • the TxD transmission methods applicable to the present invention may be extended to TxD transmission methods in which SFC is applied on the time and frequency axes in combination.
  • FIG. 16 is a simplified diagram illustrating an SFBC-based TxD transmission method according to another example of the present invention.
  • Method 3 is advantageous in that a resource area used for PTRS transmission may be reduced.
  • FIG. 17 is a simplified diagram illustrating a configuration for transmitting a PTRS on one subcarrier per PTRS AP according to an example of the present invention.
  • a PTRS is transmitted on one (or more) subcarriers per PTRS AP, there is no need for transmitting PTRSs of all PTRS APs in one symbol in the case of TxD using only APs #1 and #3 or APs #2 and #4 in one symbol as illustrated in FIG. 16 .
  • a PTRS may be transmitted in symbol #3 only through APs #1 and #3, while a PTRS may be transmitted in symbol #4 only through APs #2 and #4.
  • a specific transmission method (e.g., PTRS AP mapping, the number of transmission subcarriers, etc.) may be changed depending on whether a PTRS is transmitted in SM or TxD.
  • a specific transmission method e.g., PTRS AP mapping, the number of transmission subcarriers, etc.
  • the gNB may transmit the PTRS in the manner illustrated in FIG. 17
  • the gNB may transmit the PTRS in the manner illustrated in FIG. 9 .
  • PTRS APs that transmit the PTRS in each symbol may be determined according to APs that actually attempt data transmission in the symbol. For example, if SFBC is applied to APs #1 and #3 for data transmission, the PTRS may also be transmitted through APs #1 and #3.
  • SFBC may be applied to each symbol by using two predetermined APs.
  • SFBC may also be applied to data transmitted in the symbol by using only APs #1 and #3.
  • each modulated symbol is transmitted through all APs.
  • the ⁇ C3, C4 ⁇ pair is replaced with the ⁇ C1, C2 ⁇ pair, and thus the ⁇ C1, C2 ⁇ pair is transmitted through all APs in FIG. 12 .
  • a new PUCCH may be defined to carry UCI including an HARQ-ACK and/or CSI and/or beam-related information and/or scheduling request (SR)-related information.
  • SR scheduling request
  • the new proposed PUCCH will be referred to as an NR-PUCCH.
  • the NR-PUCCH may include a relatively short PUCCH including one or two symbols (referred to as a 1-symbol PUCCH or a 2-symbol PUCCH), or a relatively long PUCCH including 4 or more symbols (referred to as a long PUCCH) in a slot with 14 (or 7) symbols.
  • Precoder cycling may mean that a different one of digital beamforming, analog beamforming, and hybrid beamforming is performed on a predetermined time or frequency area basis. Further, the precoder cycling may include antenna switching and/or panel switching.
  • the TxD transmission method proposed by the present invention may also be applied in the same manner to other channels (e.g., NR-PDCCH, NR-PDSCH, and NR-PUSCH).
  • other channels e.g., NR-PDCCH, NR-PDSCH, and NR-PUSCH.
  • a 1-symbol PUCCH in TxD it may be configured that the same precoding/beamforming is applied on a specific frequency unit (e.g., RE group or RB group) basis.
  • a specific frequency unit e.g., RE group or RB group
  • different precoding/beamforming may be applied to a 1-symbol PUCCH having 10 RBs every 5 RBs (preset or configured by L1 signaling or higher-layer signaling).
  • the same precoding/beamforming may be configured for (or applied to) the 1-symbol PUCCH, only within contiguous frequency resources (or contiguous resources of the same comb index).
  • precoding/beamforming applied to a specific frequency unit may be determined by an actually mapped frequency-domain resource index irrespective of the amount of allocated frequency resources.
  • precoding/beamforming may be applied only to frequency resources within the same frequency band in the allocated 1-symbol PUCCH.
  • the same precoding/beamforming may be configured for (or applied to) a frequency area in which the RS includes a predetermined number of or more REs (preset or configured by L1 signaling or higher-layer signaling).
  • a sequence as long as the number of corresponding REs may be generated in a frequency area to which the same precoding/beamforming is applied.
  • the method described above in this section may be applied commonly to a PUCCH structure with an RS and UCI multiplexed in frequency division multiplexing (FDM), and a PUCCH structure transmitted without an RS by sequence selection.
  • FDM frequency division multiplexing
  • a 2-symbol PUCCH may be transmitted by applying the foregoing 1-symbol PUCCH TxD method to each symbol.
  • the same or different precoding/beamforming may be applied to two symbols.
  • a configuration of applying the same precoding/beamforming to two symbols may be applied to a case in which the first and second symbols have the same frequency resource area or a case in which one of the two symbols does not carry an RS, and the other symbol includes an RS.
  • whether to apply time-axis or frequency-axis precoding/beamforming is configurable. For example, with the same precoding/beamforming on the time axis, the foregoing 1-symbol PUCCH TxD method may be applied to each symbol, with the same precoding/beamforming on the frequency axis, different precoding/beamforming may be applied to each symbol, or with different precoding/beamforming on the time axis, the foregoing 1-symbol PUCCH TxD method may be applied to each symbol.
  • the method described above in this section may be applied commonly to the PUCCH structure with an RS and UCI multiplexed in FDM, and the PUCCH structure transmitted without an RS by sequence selection.
  • no symbol may include an RS in a long PUCCH in consideration of RS overhead. Accordingly, precoding/beamforming may be applied in a different manner in consideration of a symbol with an RS.
  • an RS and UCI are multiplexed in time division multiplexing (TDM), there may be a symbol with the RS only and a symbol with the UCI only.
  • different precoding/beamforming may be applied per hop.
  • different precoding/beamforming may be applied to each group of symbols carrying an RS.
  • different precoding/beamforming may be applied even within the one hop. If symbols are allocated in the order of UCI, RS, RS, and UCI in one hop including four symbols, different precoding/beamforming may be applied between the first two symbols and between the last two symbols. In this case, as different precoders are used, an OCC may not be applied between symbols over which a precoder is changed within the same hop.
  • different precoding/beamforming may be applied to a multi-slot long PUCCH on a slot or slot group basis (preset or configured by L1 signaling or higher-layer signaling).
  • the same coded bit may be repeatedly included or coded bits are distributedly included in the foregoing 1-symbol PUCCH TxD method, 2-symbol PUCCH TxD method, and long PUCCH TxD method.
  • the foregoing precoder cycling-based 1-symbol PUCCH TxD method, 2-symbol PUCCH TxD method, and long PUCCH TxD method may be applied.
  • a TxD method such as 2-port space frequency block code (SFBC)/space time block code (STBC) may be applied to a PUCCH, and a different precoder may be applied to each predefined frequency/time resource set by using a different AP pair.
  • SFBC 2-port space frequency block code
  • STBC space time block code
  • a UE may apply SFBC to APs #1 and #2, and also to APs #3 and #4.
  • the UE transmits a 2-symbol PUCCH
  • the UE may transmit the PUCCH in the first symbol through APs #1 and #2, and in the second symbol through APs #3 and #4, thereby separating the AP pairs from each other in the time domain.
  • APs used actually for NR-PUSCH transmission and the positions of subcarriers carrying DM-RSs may be predetermined or preset.
  • the same AP numbers may be assigned for an RS such as SRS/DM-RS(/PTRS) (e.g., for 4 APs, port numbers are assigned 1, 2, 3 and 4).
  • SRS/DM-RS(/PTRS) e.g., for 4 APs, port numbers are assigned 1, 2, 3 and 4.
  • SRS is transmitted through as many APs as the number of APs reported by the UE. If the UE reports 4 APs, an SRS transmission may be configured for APs #1, #2, #3, and #4.
  • a resource to carry an RS sequence corresponding to an AP number may be preset.
  • a DM-RS and a PCRS may be transmitted respectively in D1 and P1 through AP #1.
  • the DM-RS and the PTRS may be transmitted respectively in D2 and P2 through AP #2, in D3 and P3 through AP #3, and in D4 and P4 through AP #4.
  • a corresponding DM-RS(/PTRS) transmission resource may be configured to be a resource corresponding to an AP number scheduled in a predetermined rule.
  • the UE is configured to acquire the two pieces of information. Therefore, a gain may be achieved in terms of signaling overhead during UL scheduling.
  • the UE may transmit a DM-RS on subcarriers #0, #4 and #8 through AP #1 as pre-agreed, without additional signaling.
  • both of UE1 and UE2 are scheduled to transmit NR-PUSCHs through AP #1 in MU-MIMO UL transmission, the two UEs transmit DM-RSs on the same subcarrier, thereby degrading channel estimation performance.
  • scheduling restriction may result.
  • the present invention proposes a method of transmitting a DM-RS/NR-PUSCH and a method of indicating a transmission position for the DM-RS/NR-PUSCH. While a configuration of the present invention is described below, focusing on the DM-RS, for the convenience, the configuration may also be applied to the PTRS.
  • An AP used for NR-PUSCH transmission and the position of a resource carrying a DM-RS are indicated separately by DCI (or physical-layer signaling).
  • the UE may attempt to transmit an NR-PUSCH in TxD through APs #1 and #3.
  • a different mapping relationship between APs used for NR-PUSCH transmission and the positions of resources carrying a DM-RS is configured for each UE by higher-layer signaling (e.g., RRC signaling).
  • UE1 is configured to transmit a DM-RS in resources D1, D2, D3, and D4 (in FIG. 9 ) through APs #1, #2, #3, and #4
  • UE2 is configured to transmit a DM-RS in resources D4, D3, D2, and D1 through APs #1, #2, #3, and #4
  • the DM-RS of each UE may be transmitted in a different frequency resource.
  • section 3.3.1. and section 3.3.2. may also be applied in the same rule to the PTRS (without additional signaling).
  • an AP used for NR-PUSCH transmission, the position of a resource carrying a DM-RS, and the position of a resource carrying a PTRS may be indicated separately by additional signaling other than the DM-RS.
  • the UE may transmit the DM-RS on all subcarriers in symbol #2 (according to a preset rule).
  • some resources may not be used for either DM-RS transmission or NR-PUSCH transmission according to APs used by the UE. For example, if one UE transmits an NR-PUSCH only through one AP, three subcarriers out of four subcarriers of symbol #2 in transmission resource areas of the UE may not be used for transmitting a specific signal.
  • a specific method of allowing use of corresponding resources for an NR-PUSCH in order to efficiently use radio resources will be described in this section.
  • NR-PUSCH transmission may be allowed on a subcarrier unused for DM-RS transmission from the position of a symbol configured with DM-RS transmission to the position of the starting symbol of the NR-PUSCH. For example, if the starting symbol of the NR-PUSCH is indicated as symbol #2, and DM-RS transmission is indicated only for subcarriers corresponding to D1 and D2 in the frame structure illustrated in FIG. 9 , the UE may attempt to transmit the NR-PUSCH on the other subcarriers corresponding to D3 and D4.
  • the configuration described in section 3.3.3. may also be applied in the same manner to the PTRS (without additional signaling).
  • additional signaling other than the DM-RS it may be indicated separately whether the NR-PUSCH is to be mapped/transmitted to/on a subcarrier unused for PTRS transmission (by physical-layer or higher-layer signaling).
  • BS-UE frequency/satellite/time tracking, or phase noise of an oscillator
  • a signal such as a PTRS or a DM-RS
  • channel estimation performance is improved, thereby increasing signaling overhead and degrading the transmission performance of PUSCH data. That is, there is a tradeoff between the transmission performance of PUSCH data and signaling overhead.
  • it may be regulated that whether a corresponding signal is to be transmitted additionally (and/or information about the positions/density of resources to carry the signal and/or the sequence of the signal) is configurable by higher-layer signaling or L1 signaling.
  • the UE may also be regulated that when the UE attempts initial access on a specific subcarrier, whether the signal (i.e., the PTRS and/or the additional DM-RS) is transmitted (and/or information about the positions/density of resources to carry the signal and/or the sequence of the signal) is also configurable for a message 3 PUSCH (i.e., a PUSCH scheduled by a UL grant in a random access response (RAR) transmitted in response to an RACH transmission) in an RACH procedure.
  • This signal configuration may be indicated by a system information block (SIB) or an RAR message.
  • SIB system information block
  • the configuration of the corresponding signal i.e., the PTRS and/or the additional DM-RS
  • the UE may always transmit the PTRS (or the additional DM-RS).
  • the UE may always transmit the PTRS (or the additional DM-RS).
  • PTRS transmission method for supporting MU-MIMO between cyclic prefix (CP)-OFDM UE and DFT spread OFDM UE (DFT-s-OFDM UE)
  • the PTRS is mapped to all subcarriers in a specific symbol (like the DM-RS).
  • the UE may puncture an NR-PUSCH in REs to which the PTRS is to be mapped after performing DFT on the NR-PUSCH, or performing DFT with the number of REs except for the REs to which the PTRS is to be mapped, at the expense of the PAPR of DFT-s-OFDM.
  • PTRS mapping is performed before or after DFT.
  • the gNB may indicate post-DFT PTRS mapping, and when an NR-PUSCH is scheduled only for the DFT-s-OFDM UE, the gNB may indicate pre-DFT PTRS mapping.
  • the UE may transmit the UL signal by using a different beamforming (i.e., precoder cycling) method for each predetermined resource area carrying the UL signal.
  • a different beamforming i.e., precoder cycling
  • the UE transmits the UL signal by applying a different beamforming scheme to each of resource areas divided according to a predetermined rule in one or more symbols of one slot including a plurality of symbols.
  • the UL signal may be a PUCCH or PUSCH. While the following description is given in the context of the PUCCH by way of example, the same thing may apply to the PUSCH as another exemplary UL signal.
  • applying a different beamforming scheme to each of resource areas divided according to the predetermined rule by the UE may mean that the UE applies one or more of digital beamforming, analog beamforming, and hybrid beamforming differently to the respective resource areas.
  • the UL signal may be transmitted in a 1-symbol PUCCH structure. Then, the UE may transmit the 1-symbol PUCCH by applying a different beamforming scheme to each of the resource areas divided according to the predetermined rule.
  • the UE may receive information about the predetermined rule from the BS.
  • the information about the predetermined rule may include one of information about the size of frequency resources to which the same beamforming scheme is applied, and information about a frequency resource range to which the same beamforming scheme is applied.
  • the UE may transmit the 1-symbol PUCCH by distributedly mapping the 1-symbol PUCCH in the frequency domain within one symbol.
  • the UE may transmit the 1-symbol PUCCH by applying a different beamforming scheme to each set of contiguous frequency resources or each set of contiguous resources of the same comb index in the one symbol carrying the 1-symbol PUCCH.
  • the UL signal may be transmitted in a 2-symbol PUCCH structure.
  • the UE may transmit the 2-symbol PUCCH by applying a different beamforming scheme to each of symbols carrying the 2-symbol PUCCH.
  • the UE may transmit the 2-symbol PUCCH by applying different beamforming schemes to a symbol carrying an RS and a symbol without an RS among the symbols carrying the 2-symbol PUCCH.
  • the UE may transmit the 2-symbol PUCCH by applying a different beamforming scheme to each frequency resource area of a predetermined size in two symbols carrying the 2-symbol PUCCH.
  • the UL signal may be transmitted in a PUCCH structure exceeding 2 symbols.
  • This PUCCH structure will be referred to as a long PUCCH.
  • the UE may transmit the long PUCCH by applying different beamforming schemes to a symbol carrying an RS and a symbol without an RS among symbols carrying the long PUCCH.
  • the UE when the UE transmits the long PUCCH by frequency hopping, the UE may transmit the long PUCCH by applying a different beamforming scheme to each hop in more than two symbols carrying the long PUCCH.
  • FIG. 18 is a diagram illustrating configurations of a UE and a base station capable of being implemented by the embodiments proposed in the present invention.
  • the UE and the base station illustrated in FIG. 18 operate to implement the embodiments of the foregoing signal transmission and reception methods between a UE and a BS.
  • a UE 1 may act as a transmission end on a UL and as a reception end on a DL.
  • a base station (eNB or new generation NodeB (gNB)) 100 may act as a reception end on a UL and as a transmission end on a DL.
  • each of the UE and the base station may include a Transmitter (Tx) 10 or 110 and a Receiver (Rx) 20 or 120, for controlling transmission and reception of information, data, and/or messages, and an antenna 30 or 130 for transmitting and receiving information, data, and/or messages.
  • Tx Transmitter
  • Rx Receiver
  • Each of the UE and the base station may further include a processor 40 or 140 for implementing the afore-described embodiments of the present disclosure and a memory 50 or 150 for temporarily or permanently storing operations of the processor 40 or 140.
  • the UE 1 having the above configuration may transmit a UL signal (e.g., NR-PUCCH or NR-PUSCH) in the following manner.
  • a UL signal e.g., NR-PUCCH or NR-PUSCH
  • the UE 1 may transmit the UL signal, through the transmitter 10, by applying a different beamforming scheme to each of resource areas divided according to a predetermined rule in one or more symbols of one slot including a plurality of symbols.
  • Various rules may be available as the predetermined rule, which divide a time/frequency resource area carrying the UL signal into resource areas to which different beamforming schemes are applied.
  • the Tx and Rx of the UE and the base station may perform a packet modulation/demodulation function for data transmission, a high-speed packet channel coding function, OFDM packet scheduling, TDD packet scheduling, and/or channelization.
  • Each of the UE and the base station of FIG. 18 may further include a low-power Radio Frequency (RF)/Intermediate Frequency (IF) module.
  • RF Radio Frequency
  • IF Intermediate Frequency
  • the UE may be any of a Personal Digital Assistant (PDA), a cellular phone, a Personal Communication Service (PCS) phone, a Global System for Mobile (GSM) phone, a Wideband Code Division Multiple Access (WCDMA) phone, a Mobile Broadband System (MBS) phone, a hand-held PC, a laptop PC, a smart phone, a Multi Mode-Multi Band (MM-MB) terminal, etc.
  • PDA Personal Digital Assistant
  • PCS Personal Communication Service
  • GSM Global System for Mobile
  • WCDMA Wideband Code Division Multiple Access
  • MBS Mobile Broadband System
  • hand-held PC a laptop PC
  • smart phone a Multi Mode-Multi Band (MM-MB) terminal, etc.
  • MM-MB Multi Mode-Multi Band
  • the smart phone is a terminal taking the advantages of both a mobile phone and a PDA. It incorporates the functions of a PDA, that is, scheduling and data communications such as fax transmission and reception and Internet connection into a mobile phone.
  • the MB-MM terminal refers to a terminal which has a multi-modem chip built therein and which can operate in any of a mobile Internet system and other mobile communication systems (e.g. CDMA 2000, WCDMA, etc.).
  • Embodiments of the present disclosure may be achieved by various means, for example, hardware, firmware, software, or a combination thereof.
  • the methods according to exemplary embodiments of the present disclosure may be achieved by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • processors controllers, microcontrollers, microprocessors, etc.
  • the methods according to the embodiments of the present disclosure may be implemented in the form of a module, a procedure, a function, etc. performing the above-described functions or operations.
  • a software code may be stored in the memory 50 or 150 and executed by the processor 40 or 140.
  • the memory is located at the interior or exterior of the processor and may transmit and receive data to and from the processor via various known means.
  • the present disclosure is applicable to various wireless access systems including a 3GPP system, and/or a 3GPP2 system. Besides these wireless access systems, the embodiments of the present disclosure are applicable to all technical fields in which the wireless access systems find their applications. Moreover, the proposed method can also be applied to mmWave communication using an ultra-high frequency band.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
EP17837232.2A 2016-08-05 2017-08-02 Techniques of efficient dmrs and data transmission and reception in wireless communication systems Active EP3490185B1 (en)

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US201662371241P 2016-08-05 2016-08-05
US201762443777P 2017-01-08 2017-01-08
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WO2018026181A1 (ko) 2018-02-08
EP3490185A1 (en) 2019-05-29
US10944454B2 (en) 2021-03-09
CN109845166A (zh) 2019-06-04
US20210359735A1 (en) 2021-11-18
EP3490185A4 (en) 2020-04-15
CN109845166B (zh) 2021-07-20
US20190173546A1 (en) 2019-06-06
KR20190021469A (ko) 2019-03-05

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